Photoperiodism in Relation to Hormones as Factors in Floral Initiation and Development

@article{Hamner1938PhotoperiodismIR,
  title={Photoperiodism in Relation to Hormones as Factors in Floral Initiation and Development},
  author={Karl C. Hamner and James A. Bonner},
  journal={Botanical Gazette},
  year={1938},
  volume={100},
  pages={388 - 431}
}
1. A description is given of a simple method whereby one portion of a plant may be subjected to one photoperiod while another portion of the same plant is being subjected to another photoperiod. 2. Floral initiation in Xanthium pennsylvanicum results if plants are subjected to photoperiods shorter than 15 hours with accompanying dark periods of longer than 8 hours. If Xanthium plants are subjected continuously to photoperiods longer than 16 hours with accompanying dark periods shorter than 8… Expand
Photoperiodic Induction as Influenced by Environmental Factors
TLDR
Xanthium plants, when grafted to vegetative plants, continue to supply a stimulus for flower initiation when exposed to continuous long photoperiod, and soybeans exposed to an induction period of three or more consecutive long dark periods would not produce new primordia subsequently unless they were again exposed to another induction period. Expand
Photoperiodic Responses of Dill, a Very Sensitive Long Day Plant
TLDR
Vegetative plants transferred from conditions of short to those of long photoperiod were induced to flower after exposure to as few as four longphotoperiods, while seedlings from the commercial dill seed employed flowered soon after germination if grown on 9-hour photoper Period. Expand
Effect of Some Environmental Factors on Floral Initiation in Xanthium
  • L. Mann
  • Biology
  • Botanical Gazette
  • 1940
TLDR
Data is given showing the influence of the number of photoinductive cycles to which plants are exposed on the rate of development of flower structures and the photoperiod following a long dark period has a pronounced effect on the initiation and development of flowers. Expand
Photoperiodic Responses of Several Varieties of Soybeans
TLDR
The initiation of flower primordia in many varieties under continuous light shows that darkness is not a necessary condition for floral initiation in them, and the reactions causing induction are accelerated if the plants are subjected to daily periods of darkness. Expand
Effect of Light and Temperature on Floral Initiation in Cocklebur and Biloxi Soybean
TLDR
In cocklebur, the conditions brought about during the photoperiod may be diminished to such a point that plants fail to initiate floral primordia when subsequently subjected to a 12-hour dark period, and in Biloxi soybean the use of short alternating periods of darkness and light may be a more economical method of maintaining "short-day" plants in a vegetative condition. Expand
EXPERIMENTS ON PHOTOPERIOD IN RELATION TO THE VEGETATIVE GROWTH OF PLANTS.
  • J. Bonner
  • Biology, Medicine
  • Plant physiology
  • 1940
TLDR
Evidence is presented to show that the production of vitamin Bi, a hormone for the growth of roots, is affected by the length of day to which the plant is subjected, and this effect has a profound effect on the extent of the root system. Expand
Studies on the Nature of the Endogenous Rhythm Affecting Photoperiodic Response of Biloxi Soybean
TLDR
The results obtained with Biloxi soybean support those obtained by Lockhart and Hamner with Xanthium in which a second dark period following a brief exposure to light partially nullified the effect of an inductive dark period. Expand
Translocation of the Reproductive Stimulus in Sugar Beets
TLDR
The results indicate that the biennial is not able to synthesize reproductive-inducing substances as a result of photoperiod alone, as annuals do, but also requires cool-temperature exposure. Expand
Effect of Variation in Temperature During Photoperiodic Induction Upon Initiation of Flower Primordia in Biloxi Soybean
TLDR
None of the temperature combinations used in these experiments brought about the initiation of flower primordia when photoperiods of 16 hours were used. Expand
Growth Inhibitor Activity in Xanthium in Relation to Photoperiodism.
TLDR
In new experiments by the authors it was found that a growth inhibitor which is present in large amounts interferes with auxin analysis, and some relations of the inhibitory substance to photoperiodic responses are to be presented. Expand
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